Discussion
Assertion (A): Closing an open section with a light skin panel is a very efficient structural change.
Reason (R): The panel allows a circulating shear flow to form round the enclosed area.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. An open section resists torsion only through the small \( t^3 \) term summed over its walls, but a closed cell resists it through a circulating flow acting on the whole enclosed area. Adding a light skin to close the section can raise the torsional stiffness by two or three orders of magnitude for very little weight.
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